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Bunting “BU” Dry Lubricant
Bearings

Bunting’s “BU” product is a composite material, consisting of bonded layers of a steel backing and a porous bronze matrix, impregnated and overlaid with PTFE bearing material. The steel backing provides mechanical strength and the bronze inter-layer, impregnated with PTFE, provides a strong mechanical bond for the lining. During normal operation, a thin film from the PTFE lining is transferred to the opposing surface and maintained there throughout the working life of the bearing.

Bunting’s “BU” is available, from stock, in the form of wrapped bearings in both inch and metric sizes. Thrust washers, strip material and non-standard bearing sizes are also available.

Temperature range: -328°F/+536°F
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Item #

Stock
Item?

Nom
Size I.D

Nom
Size O.D.

Recommended Housing
Bore Min.

Recommended Housing
Bore Max.

Recommended Shaft
Size Min.

Length

M0303BU N/A No N/A 3 mm N/A 4.5 mm N/A 4.5000 mm N/A 4.5080 mm N/A 2.9940 mm N/A 3 mm
M0305BU N/A No N/A 3 mm N/A 4.5 mm N/A 4.5000 mm N/A 4.5080 mm N/A 2.9940 mm N/A 5 mm
M0306BU N/A Yes N/A 3 mm N/A 4.5 mm N/A 4.5000 mm N/A 4.5080 mm N/A 2.9940 mm N/A 5 mm
M0404BU N/A No N/A 4 mm N/A 5.5 mm N/A 5.5000 mm N/A 5.5080 mm N/A 3.9920 mm N/A 4 mm
M0406BU N/A Yes N/A 4 mm N/A 5.5 mm N/A 5.5000 mm N/A 5.5080 mm N/A 3.9920 mm N/A 6 mm
M0410BU N/A Yes N/A 4 mm N/A 5.5 mm N/A 5.5000 mm N/A 5.5080 mm N/A 3.9920 mm N/A 10 mm
M0505BU N/A Yes N/A 5 mm N/A 7 mm N/A 7.0000 mm N/A 7.0150 mm N/A 4.9780 mm N/A 5 mm
M0508BU N/A Yes N/A 5 mm N/A 7 mm N/A 7.0000 mm N/A 7.0150 mm N/A 4.9780 mm N/A 8 mm
M0510BU N/A Yes N/A 5 mm N/A 7 mm N/A 7.0000 mm N/A 7.0150 mm N/A 4.9780 mm N/A 10 mm
M0606BU N/A Yes N/A 6 mm N/A 8 mm N/A 8.0000 mm N/A 8.0150 mm N/A 5.9780 mm N/A 6 mm
M0608BU N/A Yes N/A 6 mm N/A 8 mm N/A 8.0000 mm N/A 8.0150 mm N/A 5.9780 mm N/A 8 mm
M0610BU N/A Yes N/A 6 mm N/A 8 mm N/A 8.0000 mm N/A 8.0150 mm N/A 5.9780 mm N/A 10 mm
M0710BU N/A Yes N/A 7 mm N/A 9 mm N/A 9.0000 mm N/A 9.0150 mm N/A 6.9720 mm N/A 10 mm
M0808BU N/A Yes N/A 8 mm N/A 10 mm N/A 10.0000 mm N/A 10.0150 mm N/A 7.9720 mm N/A 8 mm
M0810BU N/A Yes N/A 8 mm N/A 10 mm N/A 10.0000 mm N/A 10.0150 mm N/A 7.9720 mm N/A 10 mm
M0812BU N/A Yes N/A 8 mm N/A 10 mm N/A 10.0000 mm N/A 10.0150 mm N/A 7.9720 mm N/A 12 mm
M1010BU N/A Yes N/A 10 mm N/A 12 mm N/A 12.0000 mm N/A 12.0180 mm N/A 9.9720 mm N/A 10 mm
M1012BU N/A Yes N/A 10 mm N/A 12 mm N/A 12.0000 mm N/A 12.0180 mm N/A 9.9720 mm N/A 12 mm
M1015BU N/A Yes N/A 10 mm N/A 12 mm N/A 12.0000 mm N/A 12.0180 mm N/A 9.9720 mm N/A 15 mm
M1020BU N/A Yes N/A 10 mm N/A 12 mm N/A 12.0000 mm N/A 12.0180 mm N/A 9.9720 mm N/A 20 mm
M1208BU N/A Yes N/A 12 mm N/A 14 mm N/A 14.0000 mm N/A 14.0180 mm N/A 11.9660 mm N/A 8 mm
M1210BU N/A Yes N/A 12 mm N/A 14 mm N/A 14.0000 mm N/A 14.0180 mm N/A 11.9660 mm N/A 10 mm
M1212BU N/A Yes N/A 12 mm N/A 14 mm N/A 14.0000 mm N/A 14.0180 mm N/A 11.9660 mm N/A 12 mm
M1215BU N/A Yes N/A 12 mm N/A 14 mm N/A 14.0000 mm N/A 14.0180 mm N/A 11.9660 mm N/A 15 mm
M1220BU N/A Yes N/A 12 mm N/A 14 mm N/A 14.0000 mm N/A 14.0180 mm N/A 11.9660 mm N/A 20 mm
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